<template>
  <div>
    <h1>Two</h1>
    <h2>{{ count }}</h2>
    <button @click="$forceUpdate()">强制更新</button>
    <button @click="changeA">更新a</button>
  </div>
</template>

<script>
var b = 1;
var a = [1];
export default {
  name: "Two",
  data() {
    return {
      count: a,
    };
  },
  methods: {
    changeA() {
      b++;
      a.push(b);
    },
  },
  mounted() {
    console.log("mounted");
  },
  updated() {
    console.log("updata");
  },
};
</script>

<style></style>
